Saw-sharpening machine



(No Model.) 2 Sheets-Sheet 1.

O. PIERSON. SAW SHARPENING MACHINE.

No. 435,121. Patented Aug. 26, 1890.

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(No Model.)

0. PIERSON.

SAW SHARPENING MACHINE.

Patented Aug. 26, 1890.

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UNITED STATES PAT NT OFFICE.

OLIVER PIERSON, OF ROANN, INDIANA.

SAW-SHARPENING MACHINE.

SPECIFICATION forming part of Letters Patent No. 435,121, dated August 26, 1890. Application filed February 24, 1890. Serial No. 341,521- (No model.)

To all whom it may concern:

Be'it known that I, OLIVER PIERSON, a citizen of the United States, residing at Roann, in the county of YVabash and State of Indiana, have invented a new and useful Saw Sharpening Machine, of which the following is a specification.

This invention relates to machines for sharpening band-saws; and it has for its object to construct a machine of this class which shall be simple, durable, and entirely automatic in its operation, and which shall, furthermore, be adjustable in all its parts so as to adapt it to operate with equal efficiency upon saws having teeth of different sizes and shapes.

With these objects in view my invention consists in the improved construction, combination, and arrangement of parts, to be hereinafter fully described, and particularly pointed out in the claims.

In the drawings hereto annexed, Figure 1 is a perspective view of my improved sawsharpening machine, showing a portion of a band-saw therein in position for being operated upon. Fig. 2 is a rear elevation with a portion of the frame broken away for the purpose of exposing the interior mechanism. Fig. 3 is a vertical sectional view taken on the line a: :c of Fig. 2. Fig. 4 is a vertical transverse sectional view taken on the line y y of Fig. 3. Fig. 5 is a perspective view, on an enlarged scale, of the feed mechanism. Fig. 6 is a sectional view taken through the mechanism for adjusting the yoke in which the grinding-disk is mounted.

Like numerals of reference indicate like parts in all the figures.

The frame of the machine comprises a standard 1, upon the upper end of which is mounted a casing 2, in which the mechanism for feeding the saw forward, so as to present each tooth successively to the action of the grinding mechanism, is contained.

3 designates a bracket, which is attached to one end of the casing 2 by means of a screw or bolt 4, passing through a slot 5 in said bracket. The latter is provided at its lower end with a lug 6, having a Vertical screwthreaded perforation through which passes an adjusting-screw '7, the lower end of which is swiveled in a bracket 8, extending laterally in the casing 2. The lower end of the adjusting-screw 7 has a hand-wheel 9, by means of which it may be conveniently manipulated 5 5 to vertically adjust the bracket 3.

Mounted pivotally in the upper end of the bracket 3 is a guide-block 10, having a dovetailed groove 11, in which is mounted a slide 12, one end of which is provided with a lug 13, Go through which extends an adjusting-screw 14, one end of which is swiveled in a lug 15, extending upwardly from the block 10. The adjusting-screw 14.- is also provided with a handwheel 16, by means of which it may be manipulated. The slide 12 is provided with boxes 17, forming bearings for a shaft 18, one end of which carries an emery grinding-disk 19, of ordinary construction. The shaft 18 is also provided with a pulley 20, over which the driving-belt, to be presently described, may pass. The outer end of the slide 12 has a yoke 21, which is provided with a lug 22, through which passes an adjusting-screw 23, the lower end of which extends through a slot- 24 in the top of the casing 2 and rests upon the upper side of an arm 25, which is pivoted to a lug 26 upon the under side of the top of said casing. An arm or bracket 27 forms a'rest which supports the pivoted 8o arm 25 and prevents it from dropping too low.

The casing 2 is provided with a guideway 28 for a laterally-movable slide or carriage 29. The upper side of said carriage has a dovetailed groove 30, in which is mounted a supplementary slide 31, which may be adjusted by means of an adj Listing-screw 32, swiveled in a lug 33, that extends upwardly from the slide or carriage 29 and extends through a screu=threaded perforation in a lug 9o 34:, that extends upwardly from the supplementary slide 31. The latter is provided with an arm 35, extending upwardly through a slot in the top of the casing 2 and having a pawl 36 pivoted to its upper end and adapted to 5 engage the teeth of the saw and to feed the latter forward to the grinding mechanism. A covering-plate 37 is mountedupon the arm 35 below the pawl 36, and covers the slot in the top of the casing, through which the said Ico arm extends, thereby preventing the dust resulting from the grinding of the teeth from choking the feed mechanism.

The supplementary slide 31, which is adjustable, as described, upon the carriage .29, is provided on its upper side with a camshaped projection 38, upon which a camshaped plate 39 is adjustable by means of a set-screw 40, passing through a slot 41 in the said plate. The cam-shaped plate 39 is adapted to bear against the under side of a cam-shaped projection 42, formed upon the end of the pivoted arm 25, hereinbefore described. Said supplemental slide is furthermore provided with a triangular projection 39, serving as a back-lift of supplemental cam to engage the'projection 42 of the pivoted arm 25 on the rearward movement of the-slide, for the purpose of preventing the grinding-disk from riding upon the teeth of the saw.

The casing 2 is provided with a laterallyextending bracket 43, the outer end of which isprovided with bosses or bearings 44 for a shaft 45, the front end of which is provided with a disk 46, having a Wrist-pin 47, which is connected by a pitman 48 with the laterally-movable carriage 29, to which a reciprocating motion may thus be imparted.

The standard 1 is provided on its rear side with brackets 49, having bearin gs for a shaft 50, having a drive-pulley 51 adapted to re ceive motion by means of a belt or hand from any convenient source of power. The shaft 50 is also provided with a drum or band-wheel 52, from which a belt or band 53 passes over guide-pulleys 54, arranged in a bracket 55, mounted upon the top of the casing 2 and over the pulley 20 upon the shaft 18, carrying the grinding-disk 19, to which latter a rotary motion is in this manner conveyed. One end of the shaft 50 has a friction-wheel 56 feathered loosely and laterally adjustable by a le- V'er 56, and adapted to bear against the face of the friction-disk 57, which is mounted upon the end of a shaft 58, journaled in brackets 59, extending laterally from the standard 1.

The shaft 58 is provided with a collar 60, and a spring '61 is coiled upon the said shaft between the collar 60 and the adj acentbracket 59, the tension of said spring serving normally to throw the friction-disk 57 out of engagement with the friction-wheel 56. The opposite bracket 59 is provided with a yoke 62, in which is arranged a set-screw 63, the outer end of which is provided with a hand- Wheel 64 and the inner end of which bears against the end of the shaft 58, which latter may thus be forced against the tension of the spring 61, thereby throwing the friction-disk 57 into engagement with the friction-wheel 56. The friction-wheel 57 is constructed with a drum 65, from which a belt or band 66 passes over a pulley 67, mounted upon one end of the shaft 45, to which latter motion may thus be imparted to actuate the feed mechanism.

A hood or casing 68, mounted detachably upon the shelf or bracket 43, protects the feed mechanism from dust and injury.

69 designates a rest, which is mounted adjustably upon the front side of the standard 1 to support the saw during the operation of the device, The said rest is provided with a vertical slot 70 to receive the screw or bolt 71, by means of which it is attached to the standard. The lower end of the said rest is provided with a lug 72, through which passes the ad j usting-screw 73, the lower end of which is swiveled in a bracket 74 upon the front side of the standard and is provided with a handwheel 75, by means of which it may be manipulated.

76 designates a clamp adapted to bear against the side of the saw which is being operated upon and to hold the latter in contact with the front side of the casing 2. The said clamp is mounted pivotally upon a pin or bolt 77, mountedin a pair of lugs 78 upon the front side of the standard 1. In the lower end of the said clamp is mounted a set-screw 79, having a hand-wheel 80, by means of which it may be adjusted to bear against a spring 81, which is attached by means of a screw or bolt 82 to the front side of the standard 1. It will be seen that while the clamp 76 may be adjusted by the set-screw 79 to bear with any desired degree of pressure against the saw which is being operated upon the spring 81 will at the same time permit the said clamp to yield to some extent, and it will thus be prevented from binding the sawblade with absolute rigidity.

From the foregoing description, taken in connection with the drawings hereto annexed, the operation and advantages of my invention will be readily understood by those skilled in the art to which it appertains.

The band-saw which is to be operated upon is supported upon the vertically-adjustable rest 69, and is held by the clamp 76 in contact with the frame of the machine. The feed mechanism consists of the laterally-reciprocating carriage 29 and its attachments, all of which are capable of adjustment, in the manner described, so as to regulate the extent to which the saw shall be fed forward by the action of the pawl 36 at each throw of the carriage. The speed of the feed mechanism may be regulated by the adjustment of the friction-disk 56 with relation to the frictionwheel 57, and the said feed mechanism may be instantaneously thrown out of gear whenever desired by merely loosening the setscrew 64, when the tension of the spring 61 will instantly move the shaft 58, carrying the friction-disk, away from the friction-wheel.

The extent to which the emery-wheel shall be permitted to cut may be accuratelygaged by means of the adj Listing-screw 129;tvhich rests upon the upper side of the pivoted arm 25. The latter, it will be seen, is'engaged by the cam-plate 39 of the feed mechanism whenever the latter moves in the direction to feed the saw. The arm 25 will thus be forced in an upward direction, thereby lifting the yoke in which the emery-wheel is mounted, and thus raising the emery-wheel out of contact with the saw. The pitch of the emery-wheel may be accurately adjusted by properly adjusting the cam-plate 39, upon which the supporting arm 25 rests during operation.

It will be seen from the foregoing that I have provided a saw-sharpening device which is simple in construction, and which when properly set and adjusted will perform its work automatically and in a perfectly-accurate manner.

By properly adjusting the parts of the machine it may be adapted to operate upon saws of different sizes and having differentlyshaped teeth. The teeth will be subjected at all points to the equal action of the emery- Wheel, and danger of burning or case-hardening the teeth is thereby prevented. By the friction-feed mechanism herein described I am also enabled to gage the speed of the feed very accurately, and this is avery important consideration for the reason that emery-wheels are not often of the same hardness, and the teeth of the saw should for this reason be subjected to the action of the grinding mechanism for a period of properly-regulated duration.

Having thus described my invention, What I claim is- 1. In a saw-sharpening machine, the combination, with the frame, of a vertically-adjustable bracket, a block hinged at the upper end of said bracket and having a dovetailed groove, a slide mounted adjustably in said groove, a shaft or arbor journaled in said slide and carrying the grinding-disk, and suitable operating mechanism, substantially as set forth.

2. In a saw-sharpening machine, the combination of an arm or block hinged to a vertically-adjustable bracket, a slide mounted laterally adjustable in said arm and having a yoke at its outer end, a vertical adj ustingscrew mounted in the outer end of said yoke, and a shaft or arbor journaled in said slide and carrying the grinding-disk, substantially as set forth.

3. In a' saw-sharpening machine, the combination of an arm or block hinged to a vertically-adjustable bracket, the slide mounted adj ustablyin said arm and having a yoke at its outer end, a shaft or arbor journaled in said slide and having the grinding-disk, a vertical adjusting-screw mounted in the outer end of the yoke, a hinged arm adapted to support the said adjustingscrew, and opertending vertically through the said slide, the hinged supporting-arm, and the laterally-reciprocating carriage having a cam-plate to engage the said supporting-arm, substantially as set forth.

5. The combination of the saw-sharpening mechanism mounted in a slide laterally adj ustable in ahinged arm, the adj Listing-screw extending vertically through said slide, the hinged supporting-arm, and a reciprocating carriage having a pawl to engage the saw and feed itforward} and a cam-plate to engage the supporting-arm, substantially as set forth.

6. The combination of the grinding mechanism mounted in a slide laterally adjustable in a hinged arm, the adjusting-screw extending vertically through said slide, the hinged supporting-arm, the reciprocating carriage having a pawl to engage and feed the saw, and a slide longitudinally adjustable in said carriage and having a cam-plate to engage the sup porting-arm, substantially as set forth.

7. In a saw-sharpening machine, the combination of the reciprocating carriage having an adjustable slide carrying a pawl to engage and feed the saw and a cam-plate to engage the arm which supports the grinding mechanism, a shaft having a disk, a pitman conmeeting the latter with the reciprocating carriage, a counter-shaft having a friction-disk engaging a friction -wheel upon the main shaft, a set-screw to force the said countershaft in the direction of the main shaft, a spring to force said counter-shaft in an opposite direction, and a band connecting a pulley upon said counter-shaft with a pulley upon the feed-shaft, substantially as set forth.

8. In a saw-sharpening machine, the combinatiomwith the sharpening mechanism and the feed mechanism, of the vertically-adjustable rest to support the saw during operation, and a spring-actuated clamp to hold the saw in contact with the casing of the machine, substantially as set forth.

9. In asaW-sharpening machine, the hereindescribed clamp, connected pivotally with lugs upon the casing of the machine and having a set-screw at its lower end, in combination with a spring to receive the impact of said set-screw, substantially as and for the purpose set forth.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in presence of two witnesses.

OLIVER PIERSON.

IVitnesses:

FRANCK DEARDORFF, J. J. SUMPTER.

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